Self-clearing, dredging, and excavating bucket



Dec. 27, 1927. 1,653,905

C. HARRISON SELF CLEARING, DREDGING, AND EXCAVATING BUCKET Filed Oct. 25, 1926 on line AB of Fig. 2.

Patented Dec. 27, 1927.

crrantns Hannrson. or vanconvrn, BRITISH comma, cannon.

SELF-CLEARING, DREIDGINGQAND EXCAVATING BUCKET.

Application filed October 25, Serial No. 144,029.

This invention relates to self-clearing, dredging, and excavatingbuckets. its object is to provide a bucket. Which will be effective over a "wide range o't variety of mateitial whether a thin liquid or a tough clay, and by securing a complete evacuation of the bucket at each operation to present a clean working surface constantly to the material and so considerably improve the time efficiency of all classes of excavation work.

With these and other objects in view adopt the construction shown in the draw ings herewith which form part of thisappli- :ation. Fig. 1 is a side elevational section Fig. 2 is a plan view and Fig. 3, an enlarged detail of one of the bucket teeth. r

Taking the drawings in detail the main cavity of the bucket is marked 4; this is bounded by the semicircular portion 5, forming the bottom ofthe bucket, and the flat sides 6. The-working or excavating edge of the bucket terminates in a series of projecting teeth 7, the inner surface of the teeth being flush with the interior surface of the semi-circular plate 5, a rebate or recess 8 being provided on the inner surface of the teeth 7 to eli'ect this. I

The teeth are slotted as shown at 9, to receive the reinforcing plates 10, the former being riveted to the latter and the latter being riveted to the exterior of the bucket plate 5. y

In order to preserve a smooth contour for the entering material at the working edge of the bucket, the plate 5 is curved downwards between the several teeth as shown at 11. A lateral cutting edge '12 is provided on each side of the bucket adjacent the teeth, for the purpose of affording lateral clearance to the bucket in its progression through the excavation. The bucket is secured to and carried by any convenient form of arm as at 13.

A further important feature of the invention, apart from the particular construction ofthe working edge and the bottom contour of the cavity as herein-before described, relates to the pivotable clearing device for the load.

This consists of a rectangular loop 14 supported by a bearing at 19 in the sides 6 and provided with right and left-handed cutting edges 15 which sweep the entire curved surface of the bucket as the bail 16 is pulled over from the dotted position shown at 17,

to the opposite corresponding position at 18, the lateral members of the loop engaging at the same time both the flat surfaces 0, forming the sides of the bucket, as the loop member pivots about the centre 19, due to the mzuiipulation required by the work.

In order to facilitate the evacuation of the bucketit is made slightly wider at the top the clearing member 14 carrying the cutting edges l5being made slightly tapered at the sides to suit.

It is to be noted that in operation as the working edge carrying the teeth 7 is raised to make thescoop theclearing member 14 swings over to the position 17,and afterthe bucket has been filled and immediately prior to its evacuation is brought over to the opposite position at 18, the contents being free to slide past the teeth without impediment.

Having. now particularly described my invention what I desire to be protected in by Letters Patent, is

1. A drec ging and excavating bucket having a semi-circularl bottom and straight sides, an approximately rectangular loop within said bucket, said loop being supported from the sides of said bucket and being pivotable from and about the same centre as that from which the said semi-circular bottom is struck, the said loop being adapted to contact an arcuate portion of the interior surface of said bucket.

2. A self-clearing, dredging, and excavating bucket comprising, a bottom plate having approximately parallel edges, the said edges being secured to straight side plates, the relation of thetwo said plates being approximately rectangular, the said bottom plate forming in part a semi-circle, a rec-- tangular loop-member engaging the interior surface of said bucket, the said member being supported from the said side plates and pivotable from the centre of the said semi-circle, cutting edgesformed upon the said loop member adapted to engage the interior surface of the said bucket with a scraping action as the said member is oscillated.

3. A self-clearing, dredging, and excavating bucket comprising, a bottom plate l1aving approximately parallel edges, the said edges being secured to straight side plates, the relation of the two said plates being approximately rectangular, the said bottom plate forming in part a semi-circle, a rectangular loop-member engaging the interior surface of said bucket, the said ineinberbe- 111g supported from the said side plates and pivotable from the centre of the said semicirele, cutting edges formed upon the said. loop-1nember adapted to engage the interior surface of the said bucket with a scraping action as the said member 15 oscillated, the

teeth forming the cutting edge of the saidported from the sides of said bucket and being pivotable from and about the same centre as i that from which the said semi circular bottom is struck the said loop being adapted to contact an arcuate portion of the interior surface of said bucket, the teeth forming the cutting edge of the said bucket having shallow recesses on their interior faces and thereby adapted to receive the extremity of an extension of the said semicircular plate whereby the interior surfaces of the said teeth and plate are maintained flush with each other and so reducing the interior fr ct onal resistance of the teeth forming the cutting edge of the ;r bucket having shallow recesses on their insides, an approximately rectangular loop Within said bucket, said loop being supported from the sides of said bucket and being pivotable from and about t e aaine centre as that from which the eaidaen icircular bottom isstruck, the eaidioop beting adapted to contact an areuuteiportion of the interior sui't'aee ot said huekeh the terior faces and thereby adapted to receive the extremity of an extension ol theeaiil, semicircular plate whereby the interior sul faces of the said teeth and plate are maintained flush with each other and so reiilueing the interior frictional resistance of the id bucket, the teeth forming the cutting edge of the said bucket being slotted laterally, a reinforcing plate engaging the saitl filfit and being secured to the .underside of the said bucket bottom plate, the front extension of the said semicircular bottom plate hetween the teeth forming the working edgeol the said bucket being bent downwardlyto meet the said reinforcing plate i In testimony whereof I ailix my signature.

1 GHARLES HARRISON.

40 ing a semi-circular bottom and straigl'it 

